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| Section | Objectives |
|---|---|
| Asynchronous JavaScript | - Promises and async/await - Event loop and concurrency model - Error handling in async workflows |
| JavaScript Language Fundamentals | - Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features |
| Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| Salesforce Platform Integration | - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript |
| Browser and DOM Interaction | - Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers) |
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NEW QUESTION # 60
Given the following code:
Counter = 0;
const logCounter = () => {
console.log(counter);
);
logCounter();
setTimeout(logCOunter, 1100);
setInterval(() => {
Counter++
logCounter();
}, 1000);
What is logged by the first four log statements?
Answer: D
NEW QUESTION # 61
Code:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after execution?
Answer: C
Explanation:
Initial array:
[1, 2, 3, 4, 4, 5, 4, 4]
The loop removes every value equal to 4:
* array.splice(i, 1) removes the element at index i and shifts all later elements left.
* i-- ensures the next index is checked correctly after the shift, preventing skipping elements.
Step-by-step removal:
* Remove the first 4 # array becomes [1,2,3,4,5,4,4]
* Remove next 4 # [1,2,3,5,4,4]
* Remove next 4 # [1,2,3,5,4]
* Remove last 4 # [1,2,3,5]
Final result:
[1,2,3,5]
Option B is correct.
JavaScript Knowledge References (text-only)
* splice(index, deleteCount) removes elements and shifts remaining items.
* Adjusting the loop index when deleting prevents skipping items.
* Arrays update length dynamically after splice().
NEW QUESTION # 62
Refer to the following code block (with corrected template literals using backticks):
01 class Animal {
02 constructor(name) {
03 this.name = name;
04 }
05
06 makeSound() {
07 console.log(`${this.name} is making a sound.`);
08 }
09 }
10
11 class Dog extends Animal {
12 constructor(name) {
13 super(name);
14 this.name = name;
15 }
16 makeSound() {
17 console.log(`${this.name} is barking.`);
18 }
19 }
20
21 let myDog = new Dog( ' Puppy ' );
22 myDog.makeSound();
What is the console output?
Answer: A
Explanation:
* Animal class:
* Has a constructor that sets this.name.
* Has a makeSound method that logs a message using this.name.
* Dog class:
* Extends Animal.
* Its constructor calls super(name) to run the parent constructor, which sets this.name.
* It overrides makeSound() to log:
* console.log(`${this.name} is barking.`);
* Instantiation:
let myDog = new Dog( ' Puppy ' );
myDog.makeSound();
* new Dog( ' Puppy ' ):
* Calls Dog constructor with name = ' Puppy ' .
* Inside, super(name) sets this.name = ' Puppy ' in the Animal constructor.
* Then this.name = name; in the Dog constructor keeps it as ' Puppy ' .
* myDog.makeSound():
* Calls the overridden makeSound() in Dog.
* Logs: " Puppy is barking. "
No reference errors, no undefined; the output is:
Puppy is barking.
Study Guide Concepts:
* ES6 classes and inheritance (extends)
* super() in subclass constructors
* Method overriding in subclasses
* Template literals: `${this.name} ...`
NEW QUESTION # 63
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
01 let res = sum3([1, 2, 3]);
02 console.assert(res === 6);
03
04 res = sum3([1, 2, 3, 4]);
05 console.assert(res === 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array.
Which two results occur when running the test on the updated sum3 function?
Answer: B,C
Explanation:
New behavior: sum3 now returns the sum of all elements .
* Line 01: sum3([1, 2, 3]) # 1 + 2 + 3 = 6
* Assertion on line 02: res === 6 # passes.
* Line 04: sum3([1, 2, 3, 4]) # 1 + 2 + 3 + 4 = 10
* Assertion on line 05: res === 6 # 10 === 6 is false, so the assertion fails.
So:
* Line 02 assertion passes # D.
* Line 05 assertion fails # C.
NEW QUESTION # 64
Refer to the following object:
01 const cat = {
02 firstName: ' Fancy ' ,
03 lastName: ' Whiskers ' ,
04 get fullName(){
05 return this.firstName + ' ' + this.lastName;
06 }
07 };
How can a developer access the fullName property for cat?
Answer: B
Explanation:
* fullName is defined as a getter :
get fullName() { ... }
Getters are accessed like properties , not like functions.
So:
cat.fullName; // " Fancy Whiskers "
No parentheses.
Why others are wrong:
* A: cat.fullName() tries to call the returned string as a function.
* B and C: These properties (get, function) do not exist; they are misinterpretations of syntax.
NEW QUESTION # 65
......
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